Russian
23 mm (0.91") AN-23
Updated 27 August 2006
This was a twin mount developed from the upper turret used on the Tu-95 "Bear" bombers.  The naval mount was accepted into service in 1964 and was used on light ships.

These guns were gas-operated and belt-fed.  The barrel was monobloc with a blade type breech.  Fire control used a Ksenon-125 radar.
WNRussian_23mm_AN-23_pic.jpg

23 mm Twin Mounting
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Gun Characteristics
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Designation 23 mm (0.91") AN-23
Ship Class Used On Pr. 125 experimental torpedo boats and Pr. 125A border guard patrol ships 
Date Of Design N/A
Date In Service 1964
Gun Weight N/A
Gun Length oa N/A
Barrel Length N/A
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 1,200 rounds per minute
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Ammunition
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Type Fixed
Weight of Complete Round HE-FRAG incendiary tracer - 0.73 lbs. (0.331 kg)
HE-FRAG incendiary - 0.745 lbs. (0.338 kg)
Projectile Types and Weights HE-FRAG incendiary tracer - 0.388 lbs. (0.176 kg)
HE-FRAG incendiary - 0.406 lbs. (0.184 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity HE-FRAG incendiary tracer - 2,330 fps (710 mps)
HE-FRAG incendiary - 2,260 fps (690 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun 1,000 rounds
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Range
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Elevation With 0.73 lbs. (0.331 kg) shells
Max. Effective Range 2,187 yards (2,000 m)
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Mount / Turret Data
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Designation Twin Mount AN-23
Weight  N/A
Elevation -4 / +90 degrees
Elevation Rate 45 degrees per second
Train 360 degrees
Train Rate 45 degrees per second
Gun recoil N/A
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Data from
"Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland (Russian) Artillery) by A.V. Shirokorad
Special help from Vladimir Yakubov